6N7 RCA used/tests like new 1942 era (3.3/3.1ma)

6N7 RCA used/tests like new 1942 era

3.3ma Gm=1600

3.1ma Gm=1500

(6N7=6A6=ECC31, 6N7=Type 53 with different filament voltage, also see 5694)
(the best sounding 6N7 type ever made is the ECC31 Mullard)

– Sun Audio SV-6V6SE 2008